[llvm] [AArch64][GISel] Support SVE with 128-bit min-size for G_LOAD and G_STORE (PR #92130)

[David Green via llvm-commits]

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@@ -329,6 +335,20 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
     return ValTy.isPointerVector() && ValTy.getAddressSpace() == 0;
   };
 
+  if (ST.hasSVE()) {
+    for (const auto OpCode : {G_LOAD, G_STORE}) {
+      getActionDefinitionsBuilder(OpCode)
+      .legalForTypesWithMemDesc({
+        // 128 bit base sizes
+        {nxv16s8, p0, nxv16s8, 128},
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davemgreen wrote:

Yeah 8 should be fine. SDAG seems to accept the smaller alignments.

https://github.com/llvm/llvm-project/pull/92130